A new compressor oil pump structure

Abstract

The present invention discloses a novel compressor oil pump structure, including a crankshaft, wherein the crankshaft includes a short shaft, a balancing plate, and a long shaft, wherein the outer wall of the long shaft is provided with a spiral groove, and the lower end of the spiral groove is provided with a radially extending lower end hole, and the interior of the long shaft is provided with an oil suction channel, one end of the oil suction channel is connected with the lower end hole of the spiral groove, and the other end of the oil suction channel is connected to the oil suction hole, and the oil suction hole is located at the lower end of the outer peripheral side of the long shaft; the lower end of the long shaft is provided with an outer sleeve oil suction pipe; the present invention arranges the oil suction hole on the outer peripheral side of the long shaft, so that the eccentricity of the oil suction pipe is larger and the oil pumping capacity is better.

Description

Technical Field

[0001] The invention relates to the technical field of compressor equipment, and in particular to a novel compressor oil pump structure. Background Art

[0002] The compressor is a driven fluid machine that can boost low-pressure gas to high-pressure gas. It is the heart of the refrigeration system. It sucks low-temperature and low-pressure refrigerant gas from the suction pipe, compresses it by driving the piston through the motor, and discharges high-temperature and high-pressure refrigerant gas to the exhaust pipe, providing power for the refrigeration cycle, thereby realizing the refrigeration cycle of compression → condensation (heat release) → expansion → evaporation (heat absorption).

[0003] The structure of the compressor includes cylinder, rotor, stator, piston, valve plate, connecting rod, crankshaft, end cover and other parts. There are many parts that move relative to each other, especially the parts that move relative to each other need to meet certain lubrication and cooling effects.

[0004] For reciprocating piston refrigeration compressors, there are two existing oil pump structures:

[0005] 1) Crankshaft with inner sleeve oil suction pipe, such as Figure 5 As shown, the oil suction pipe is embedded in the larger inner hole at the lower end of the crankshaft major axis, and the oil suction pipe is further embedded with an oil suction spacer.

[0006] 2) One-piece crankshaft without oil suction, such as Figure 6 As shown, the oil pumping function is an inclined oil hole at the lower end of the long shaft, and the oil pumping capacity is related to the eccentricity and angle of the inclined hole.

[0007] The prior art Chinese utility model patent with application number CN201510535105.1 disclosed a new type of crankshaft for a refrigeration compressor on November 11, 2015, including a crankshaft long axis (i.e., long axis body), a crankshaft short axis (i.e., eccentric short axis body) and a balance block, as well as structures such as proximal spiral grooves, centrifugal grooves, distal spiral grooves, exhaust holes, centrifugal holes, oil inlet holes, oil holes and crankshaft oil sleeves. The new type of crankshaft for a refrigeration compressor provided by the invention has a simple structure, is easy to process and install, and can realize a new type of crankshaft that is feasible for low-speed oil pumping and reasonable for high-speed oil pumping. It solves the problem of insufficient oil pumping at low speed and excessive oil pumping at high speed in traditional variable frequency compressors.

[0008] However, the existing technologies all have the following technical defects: (1) For the first type of inner sleeve oil suction pipe structure, in order to ensure the strength of the crankshaft, the outer wall of the inner hole must have a certain thickness. Therefore, the actual diameter of the oil hole for centrifugal pumping oil is 2-3mm smaller than the outer diameter of the long shaft. Therefore, in order to ensure smooth oil pumping, the diameter of the crankshaft long shaft cannot be too small. Especially when used in variable frequency compressors, at low speeds below 1200 rpm, oil may not be pumped out; (2) For the second type of integrated crankshaft (without oil suction pipe), this structure is generally used for fixed frequency compressors. The eccentricity of the center of the lower end surface of the crankshaft oblique oil hole cannot be too large, otherwise the lower end of the oil hole will be broken, and the angle cannot be too large, otherwise the upper end of the oil hole will be broken. In order to ensure smooth oil pumping, the diameter of the crankshaft long shaft cannot be too small. Summary of the invention

[0009] The purpose of the present invention is to provide a new compressor oil pump structure to address the problems existing in the prior art. By arranging the oil suction hole on the outer peripheral side of the long shaft, the eccentricity of the oil suction pipeline is larger and the oil pumping capacity is better.

[0010] To achieve the above object, the technical solution adopted by the present invention is:

[0011] A novel compressor oil pump structure includes a crankshaft, which includes a short shaft, a balancing plate, and a long shaft. One end of the short shaft is connected to the eccentric position of the upper side of the balancing plate, and one end of the long shaft is connected to the center position of the lower side of the balancing plate. The outer wall of the long shaft is provided with a spiral groove, and the upper end of the spiral groove is provided with an upper end hole extending radially along the long shaft. One end of the upper end hole located in the rotating crankshaft is connected to an oil outlet channel, and the lower end of the spiral groove is provided with a lower end hole extending radially along the long shaft. An oil suction channel is provided inside the long shaft, and one end of the oil suction channel is connected to the lower end hole of the spiral groove, and the other end of the oil suction channel is connected to the oil suction hole, which is located at the lower end of the outer peripheral side of the long shaft; the outer side of the lower end of the long shaft is provided with an outer sleeve oil suction pipe.

[0012] In the above scheme, the crankshaft is driven to rotate by the motor in the compressor, and the lower end of the long shaft is immersed in the oil pool at the bottom of the compressor. When the long shaft rotates, the lubricating oil is sucked from the oil suction hole. Under the action of centrifugal force, the lubricating oil passes through the oil suction channel and flows out from the lower end hole, enters the spiral groove, and then enters the oil outlet channel from the upper end hole of the spiral groove. The lubricating oil is guided from the oil outlet channel to the position that needs to be cooled;

[0013] The key point of the above scheme is that the oil suction holes in the prior art are all opened on the lower end surface of the long shaft, which will result in insufficient oil pumping capacity. The present application opens the oil suction holes on the outer peripheral side of the long shaft, so that the oil suction channel connected to the oil suction holes can be set to have a larger inclination angle, thereby improving the oil pumping capacity.

[0014] Furthermore, the oil suction hole is located at the intersection of the outer circumference of the long shaft and the lower end surface, the lower end of the oil suction hole is arranged at the edge of the lower end surface of the long shaft, the side end of the oil suction hole is arranged at the outer circumference of the long shaft, and the upper end of the oil suction hole is inclined inward along the radial direction of the long shaft. By arranging the side end of the oil suction hole at the outer circumference of the long shaft, the lubricating oil is more likely to rise along the oil suction hole, thereby improving the oil pumping capacity.

[0015] Furthermore, the inner side wall of the outer jacket oil suction pipe covers the side end of the oil suction hole, and the lower end of the outer jacket oil suction pipe is provided with an oil inlet hole. The outer jacket oil suction pipe rotates with the long axis, and the outer jacket oil suction pipe absorbs the lubricating oil in the oil pool for more convenient oil pumping.

[0016] Furthermore, an oil pumping spacer is fixedly provided in the outer casing oil suction pipe, and the oil pumping spacer divides the oil inlet hole into two parts.

[0017] Furthermore, the outer casing oil suction pipe is interference connected with the long axis.

[0018] Furthermore, the peripheral side surface of the short shaft is provided with an oil outlet hole and an oil distribution groove passing through the oil outlet hole. The oil distribution groove is used to guide and distribute the lubricating oil.

[0019] Furthermore, the oil outlet hole is connected to the oil outlet channel, one end of the oil outlet channel is located inside the short axis, and the other end of the oil outlet channel extends to the long axis and is connected to the upper end hole. Since the short axis and the long axis are not on the same axial direction, the oil outlet channel can be set to be inclined to facilitate oil outlet.

[0020] Furthermore, a gas channel is provided inside the long shaft, one end of the gas channel extends to the lower end surface of the long shaft, and the other end extends to the upper end surface of the balancing disc. The gas channel is used to discharge air in the lubricating oil.

[0021] Furthermore, the rotation direction of the spiral groove is the same as that of the long axis, and the spiral groove is used to make the lubricating oil spiral upward under the action of centrifugal force.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The oil suction hole in the prior art is opened on the lower end face of the long shaft, which will result in the oil suction hole not being too eccentric from the center of the lower end face, otherwise the lower end of the oil hole will be broken. However, the present application opens the oil suction hole on the outer peripheral side of the long shaft. Under the same crankshaft diameter as the prior art, the oil suction channel connected to the oil suction hole can be set to have a larger inclination angle, that is, the eccentricity of the oil suction channel is larger, thereby improving the oil pumping capacity;

[0024] 2. By arranging the outer sleeve oil suction pipe on the outer side wall of the long shaft, the inner diameter of the outer sleeve structure for pumping oil is larger than that of the inner sleeve structure in the prior art, thereby improving the oil pumping capacity;

[0025] 3. When the crankshaft diameter is constant, compared with the existing structure with oil suction pipe, the oil pumping capacity is stronger, which can ensure that when used in variable frequency compressor, the oil can be pumped smoothly at a lower speed;

[0026] 4. When the speed is constant and the oil pumping capacity is kept constant, the crankshaft diameter can be designed to be smaller, thereby reducing the friction area, reducing friction power consumption and improving the COP value. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an exploded schematic diagram of a novel compressor oil pump structure of the present invention;

[0028] Figure 2 It is an exploded schematic diagram of a novel compressor oil pump structure of the present invention;

[0029] Figure 3 A schematic diagram of a novel compressor oil pump structure of the present invention;

[0030] Figure 4 A perspective view of a novel compressor oil pump structure of the present invention;

[0031] Figure 5 It is a schematic diagram of the oil pump structure in the prior art of the present invention;

[0032] Figure 6 It is a schematic diagram of the oil pump structure in the prior art of the present invention;

[0033] In the figure: 1. short shaft; 2. balance plate; 3. long shaft; 4. spiral groove; 5. upper end hole; 6. oil outlet channel; 7. lower end hole; 8. oil suction channel; 9. oil suction hole; 10. outer casing oil suction pipe; 11. oil inlet hole; 12. oil outlet hole; 13. oil distribution groove; 14. gas channel. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "up", "down", "left", "right", "top", "bottom", "inside", "outside", "horizontal", "vertical", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] like Figures 1 to 4 As shown, a novel compressor oil pump structure includes a crankshaft, the crankshaft includes a short shaft 1, a balancing plate 2, and a long shaft 3, one end of the short shaft 1 is connected to the eccentric position of the upper side of the balancing plate 2, one end of the long shaft 3 is connected to the center position of the lower side of the balancing plate 2, the outer wall of the long shaft 3 is provided with a spiral groove 4, the upper end of the spiral groove 4 is provided with an upper end hole 5 extending along the radial direction of the long shaft 3, one end of the upper end hole 5 located in the long shaft 3 is connected with an oil outlet channel 6, the lower end of the spiral groove 4 is provided with a lower end hole 7 extending along the radial direction of the long shaft 3, an oil suction channel 8 is provided inside the long shaft 3, one end of the oil suction channel 8 is communicated with the lower end hole 7 of the spiral groove 4, the other end of the oil suction channel 8 is connected to the oil suction hole 9, and the oil suction hole 9 is located at the lower end of the outer peripheral side of the long shaft 3; the outer side of the lower end of the long shaft 3 is provided with an outer sleeve oil suction pipe 10.

[0037] In the above scheme, the crankshaft is driven to rotate by the motor in the compressor, and the lower end of the long shaft 3 is immersed in the oil pool at the bottom of the compressor. When the long shaft 3 rotates, the lubricating oil is sucked from the oil suction hole 9. Under the action of centrifugal force, the lubricating oil passes through the oil suction channel 8 and flows out from the lower end hole 7 to enter the spiral groove 4, and then enters the oil outlet channel 6 from the upper end hole 5 of the spiral groove 4. The lubricating oil is guided from the oil outlet channel 6 to the position that needs to be cooled;

[0038] The key point of the above scheme is that the oil suction holes 9 in the prior art are all opened on the lower end surface of the long shaft 3, which will result in insufficient oil pumping capacity. The present application opens the oil suction holes 9 on the outer peripheral side of the long shaft 3, so that the oil suction channel 8 connected to the oil suction holes 9 can be set to have a larger inclination angle, thereby improving the oil pumping capacity.

[0039] Furthermore, the oil suction hole 9 is located at the intersection of the outer peripheral side and the lower end face of the long shaft 3, the lower end of the oil suction hole 9 is arranged at the edge of the lower end face of the long shaft 3, the side end of the oil suction hole 9 is arranged at the outer peripheral side of the long shaft 3, and the upper end of the oil suction hole 9 is inclined inwardly along the radial direction of the long shaft 3. By connecting the side end of the oil suction hole 9 to the outer peripheral side of the long shaft 3, the lubricating oil can more easily rise along the oil suction hole 9, thereby improving the oil pumping capacity.

[0040] The inner side wall of the outer sleeve oil suction pipe 10 covers the side end of the oil suction hole 9, and the lower end of the outer sleeve oil suction pipe 10 is provided with an oil inlet hole 11. The outer sleeve oil suction pipe 10 rotates with the long shaft 3, and the outer sleeve oil suction pipe 10 absorbs the lubricating oil in the oil pool for more convenient oil pumping.

[0041] Furthermore, an oil pumping spacer is fixedly provided in the outer casing oil suction pipe 10, and the oil pumping spacer divides the oil inlet hole 11 into two parts.

[0042] Furthermore, the outer casing oil suction pipe 10 and the long shaft 3 are in interference connection.

[0043] Furthermore, an oil outlet hole 12 and an oil distribution groove 13 passing through the oil outlet hole 12 are provided on the peripheral side surface of the short shaft 1. The oil distribution groove 13 is used to guide and distribute the lubricating oil.

[0044] Furthermore, the oil outlet hole 12 is connected to the oil outlet channel 6, one end of the oil outlet channel 6 is located inside the short shaft 1, and the other end of the oil outlet channel 6 extends to the long shaft 3 and is connected to the upper end hole 5. Since the short shaft 1 and the long shaft 3 are not on the same axial direction, the oil outlet channel 6 can be set to be inclined to facilitate pumping oil to the lubrication part.

[0045] Furthermore, a gas passage 14 is provided inside the long shaft 3, one end of the gas passage 14 extends to the lower end surface of the long shaft 3, and the other end extends to the upper end surface of the balancing disc 2. The gas passage 14 is used to discharge excess air in the lubricating oil.

[0046] Furthermore, the rotation direction of the spiral groove 4 is the same as that of the long axis 3, and the spiral groove 4 is used to make the lubricating oil spiral upward under the action of centrifugal force.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel compressor oil pump structure, characterized in that: The crankshaft includes a short shaft, a balancing plate, and a long shaft, one end of the short shaft is connected to the eccentric position of the upper side of the balancing plate, one end of the long shaft is connected to the central position of the lower side of the balancing plate, an outer wall of the long shaft is provided with a spiral groove, an upper end of the spiral groove is provided with an upper end hole extending along the radial direction of the long shaft, one end of the upper end hole located in the long shaft is connected with an oil outlet channel, a lower end of the spiral groove is provided with a lower end hole extending along the radial direction of the long shaft, an oil suction channel is provided inside the long shaft, one end of the oil suction channel is communicated with the lower end hole of the spiral groove, the other end of the oil suction channel is connected to the oil suction hole, and the oil suction hole is located on the long shaft at the intersection of the outer peripheral side and the lower end surface, the lower end of the oil suction hole is arranged at the edge of the lower end surface of the major axis, the side end of the oil suction hole is arranged on the outer peripheral side of the major axis, and the upper end of the oil suction hole is inclined radially inward along the major axis; an outer sleeve oil suction pipe is sleeved on the outer side of the lower end of the major axis; an oil outlet hole and an oil distribution groove passing through the oil outlet hole are arranged on the peripheral side surface of the minor axis; the oil outlet hole is connected to the oil outlet channel, one end of the oil outlet channel is located inside the minor axis, and the other end of the oil outlet channel extends to the major axis and is connected to the upper end hole; the inner side wall of the outer sleeve oil suction pipe covers the side end of the oil suction hole, and an oil inlet hole is arranged at the lower end of the outer sleeve oil suction pipe.

2. A novel compressor oil pump structure according to claim 1, characterized in that: An oil pumping spacer is fixedly arranged in the outer casing oil suction pipe, and the oil pumping spacer divides the oil inlet hole into two parts.

3. A novel compressor oil pump structure according to claim 1, characterized in that: The outer casing oil suction pipe is interference connected with the long shaft.

4. A novel compressor oil pump structure according to claim 1, characterized in that: A gas channel is provided inside the long shaft, one end of the gas channel extends to the lower end surface of the long shaft, and the other end of the gas channel extends to the upper end surface of the balancing disk.

5. A novel compressor oil pump structure according to claim 1, characterized in that: The rotation direction of the spiral groove is the same as that of the long axis, and the spiral groove is used to make the lubricating oil rise in a spiral under the action of centrifugal force.

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